IOP

• Institute of Optronics, a Pakistani technical organization
• Institute of Physics, London-based professional association for physicists
• IOP Publishing, its publishing company
• Institute of Physics, Bhubaneswar, an Indian research institute
• Institute of Psychiatry, Psychology and Neuroscience, a school of King's College London, England, previously known as Institute of Psychiatry (IoP)
• Institute of Play, an American educational corporation

• UGV Interoperability Profile
• Cromemco IOP, an input/output processor S-100 card
• Intraocular pressure, the fluid pressure inside the eye
• Intensive outpatient program, a rehabilitation therapy

• Independent Olympic Participant: IOC country code
• Integrated Options Portfolio, a portfolio of investments allowing the owner to change those investments
• Isle of Palms, South Carolina, US
• Italian occult psychedelia, a subgenre of Italian psychedelic music
• Industry on Parade, 1950s era sponsored television series of films

• {{look from|Iop}}
• Institute of Physics (disambiguation)
• Institute of Politics (disambiguation)
• IOPS, input/output operations per second

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